In a large bowl, beat eggs and sugar. Add apple, cinnamon, and vanilla extract, and mix until combined. Stir in flour and cottage cheese and combine well. Coat a medium skillet or a griddle with vegetable cooking spray and heat over medium heat. Using a 1/2 cup measure, pour the batter onto the hot pan. Cook until nearly set, then flip and cook until golden brown. Dust pancakes with powdered sugar and cinnamon, if desired.